CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 4 - MCQExams.com

How will you find out the maximum number of electrons in the main energy level?
  •  $$n$$
  •  $$n^2$$
  •  $$2n^4$$
  •  $$2n^2$$
Atomic number of Radon is:
  • 54
  • 86
  • 72
  • 68
A fine spectrum is splitting of a spectrum into closely spaced lines.
  • True
  • False
Which of the following statements is false?
  • Bohr's theory explains only the spectra of single electron species.
  • The energy of an electron remains constant during electronic transition.
  • The angular momentum of an electron is quantised.
  • According to Bohr's theory, electrons revolve around the nucleus in circular orbits.
The atomic number of magnesium isThe number of protons in the nucleus of magnesium atom is:
  • 6
  • 10
  • 12
  • 24
According to Bohr's atomic model, electrons revolve around the nucleus in stationary orbits.
  • True
  • False
The electrons revolve around the nucleus only in certain fixed paths called:
  • orbits
  • orbitals
  • center
  • layer
The ratio of mass of proton to electron is about:
  • $$1.8\times 10^{-3}$$
  • $$1.8\times 10^{3}$$
  • 1
  • 0
Isotopes has different:
  • physical properties
  • chemical properties
  • atomic number
  • mass number
Atoms of two elements P and Q have 5 electrons in $$2^{nd}$$ shell and $$3^{rd}$$ shell respectively.  What will be the atomic numbers of these elements?
  • 4 : 15
  • 5 : 15
  • 7 : 13
  • 7 : 15
The first use of quantum theory to explain the structure of atom was made by:
  • Heisenberg
  • Bohr
  • Planck
  • Einstein
Which of the following is true when Bohr gave his model for hydrogen atom?
  • It was not known that hydrogen lines could be explained as differences of terms like $$R/n^2$$ with $$R$$ being a constant and $$n$$ an integer
  • It was not known that positive charge is concentrated in a nucleus of small size
  • It was known that radiant energy occurred in energy bundles defined by $$hv$$ with $$h$$ being a constant and $$v$$ a frequency
  • Bohr knew terms like $$R/n^2$$ and in the process of choosing allowed the orbits to fit them, he got angular momentum = $$nh/2\pi$$ as deduction
In Bohr's model of hydrogen atom, 
  • The radius of $$nth$$ orbit is proportional to $$n^2$$
  • The total energy of electron in $$n^{th}$$ orbit is proportional to $$n$$
  • The angular momentum of the electron in an orbit is an integral multiple of $$h/2\pi$$
  • The magnitude of the potential energy of electron in any orbit is greater than its Kinetic energy
Two isotopes of an element X are present in the ratio of 1:2, having mass number M and (M+0.5) respectively. Find the mean mass number of X.
  • $$M+\cfrac { 2 }{ 3 } $$
  • $$M+\cfrac { 1 }{ 3 } $$
  • $$M+\cfrac { 1 }{ 4 } $$
  • $$M+3 $$
Following are the p-block elements.
Atomic numbers : $$Ge$$ = 32  , $$As$$ = 33  , $$Se$$ = 34
Which of the these elements belong to $$14^{th}$$ group and $$4^{th}$$ period?
  • $$Ge$$
  • $$As$$
  • $$Se$$
  • None of the above
Two electrons occupying the same orbital are distinguished by:
  • Principle quantum Number
  • Magnetic quantum number
  • Azimuthal quantum number
  • Spin quantum number
Impossible orbital among the following is
  • $$3f$$
  • $$2p$$
  • $$4d$$
  • $$2s$$
When $$Z$$ is doubled in an atom, which of the following statement is consistent with Bohr's theory?
  • Energy of a state is doubled
  • Radius of an orbit is doubled
  • Velocity of electrons in the orbit is doubled
  • Radius of an orbit is quadrupled.
Which of the following isotopes is likely to be most stable?
  • $$_{30}^{71}\textrm{Zn}$$
  • $$_{30}^{66}\textrm{Zn}$$
  • $$_{30}^{64}\textrm{Zn}$$
  • none of these
J.J.Thomson for the first time identified an electron as a particle and his son G.P.Thomson first time identified an electron as a wave and both were awarded Nobel prizes in different years. 
  • True
  • False
State True or False.

$$\alpha $$-particle, when passed through gases, cause large ionisation.
  • True
  • False
State True or False.
The properties of elements are periodic function of their atomic number.
  • True
  • False

State whether the given statement is true or false :


Elements with an odd number of protons usually have only one or two stable isotopes.
  • True
  • False
State True or False.
$$H^2$$ is more reactive than $$H^1$$.
  • True
  • False
The number of electrons in a neutral atom is equal to:
  • atomic mass number
  • number of neutrons
  • its valency
  • number of protons
State True or False.
Solutions of Schrodinger equation for $$H$$-atom give the same set of values of the energy levels as does the Bohr's theory.
  • True
  • False
What is the difference in number of neutrons in Protium and Deuterium?
  • 1
  • 2
  • 3
  • 4
 Matter is composed of:
  • atoms
  • molecules
  • tiny particles
  • all of the above
In the nuclear reaction $$H^2+H^2\rightarrow He^3 +X,$$ $$X$$ stands for:
  • $$ _{+1}{e^{0}}$$
  • $$ _0{n^{1}}$$
  • $$ _{-1}{e^{0}}$$
  • $$H^1$$
Matter is defined as anything that ____________.
  • occupies space and has mass
  • has mass only
  • occupies space only
  • none of the above
Determine the number of electron in the isotope of 'H' (mass no. 2).
  • 1
  • 2
  • 0
  • 3
Matter is __________.
  • everything around you
  • anything that has mass and takes up space
  • anything that has mass
  • none of the above
Identify the incorrect statement.
  • Charges on an electron and proton are equal and opposite.
  • Neutron have no charge.
  • Electron and proton have same mass.
  • Masses of proton and neutron are nearly the same.
State whether the statement is true or false:

Isotopes are the atoms of the different element.
  • True
  • False
An atom contains eleven protons. State its atomic number and the number of electrons it contains.
  • 12, 12
  • 12, 11
  • 11, 11
  • 12, 13
An atom of an element has two electrons in the M shell. Identify its atomic number.
  • 10
  • 12
  • 14
  • 15
According to whose atomic model, electrons are embedded in a gel of positive charge?
  • Dalton's model
  • Bohr's model
  • Thomson's model
  • Rutherford's model
Consider the following isotopes of chlorine:
$$_{17}Cl^{35},_{17}Cl^{37}$$,
Atomic masses of these isotopes are different, while their chemical properties are same. In the Mendeleev's periodic table isotopes of chlorine was placed: 
  • in the different groups
  • in the same group
  • in different periods
  • both (A) and (C) are correct
If Aufbau rule is not followed in filling of sub orbitals, then block of the element will change in :
  • K(19)
  • Sc(21)
  • V(23)
  • Ni(28)
Which of the following properties can only be a whole number?
  • Atomic mass
  • Atomic volume
  • Atomic radius
  • Mass number
Bohr's atomic model can explain the spectrum of:
  • hydrogen atoms only
  • atoms or ions which are unielectron
  • atoms or ions which have only two electrons
  • hydrogen molecule
Many elements have non integral atomic masses because :
  • they have isotopes
  • their isotopes have non-integral masses
  • their isotopes have different masses
  • the constituents, neutrons, protons and electrons combine to give fractional masses
Atomic mass of an element is not necessarily a whole number becuase :
  • it contains electrons, protons and neutrons
  • it exists in all tropic forms
  • it contains isotopes
  • atoms are no longer indivisible
Matter can be defined as something that:
  • Occupies space
  • Has mass
  • Exists in three states
  • All of the above
Radioactivity is generally does not found in :
  • light nuclei
  • stable nuclei
  • heavy nuclie
  • nuclei of intermediate mass
Which statement about atom is incorrect?
  • Atoms are invisible
  • All atoms have same number of protons and electrons
  • Atoms are made up of subatomic particles
  • It has mass
State True or False.
Gamma rays produce maximum ionization in gases.
  • True
  • False
Alpha particles are positively charged and contains the nucleus of ________ atom.
  • $$He$$
  • $$H$$
  • $$Li$$
  • $$H^+$$
Which of the following statements about radioactivity is/are true ?
  • It involves outer electrons activity
  • It is not affected by temperature or pressure
  • It is an exothermic process
  • The radioactivity of an element is not affected by any other element compounded by it
As a balloon is filled with water, it expands and increases in weight. This shows that water:
  • Has mass
  • Occupies space
  • Is a kind of matter
  • All of these
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